German Chancellor Angela Merkel's CDU party suffered its second electoral blow in two weeks on Sunday, slumping to its lowest level since 1990 in a Berlin state vote that rejected her open-door refugee policy.
Voters turned to the anti-immigrant Alternative for Germany (AfD), which with 12.9 percent of the vote will enter its 10th regional assembly among the country's 16 states.
A year before a national election, the result is set to raise pressure on Merkel and deepen rifts in her conservative camp, with more sniping expected from her CSU allies in Bavaria.
The CSU's Bavarian finance minister Markus Soeder was quick to call it the "second massive wake-up call" in two weeks.
"A long-term and massive loss in trust among traditional voters threatens the conservative bloc," he told the Bild daily, adding Merkel's right-left national coalition had to win back support by changing course on its immigration policy.
Merkel's Christian Democrats were routed in the eastern state of Mecklenburg-Vorpommern two weeks ago, triggering calls from the CSU for her to toughen up her migrant policy.
In particular, they want a cap of 200,000 refugees per year, which Merkel rejects.
The secretary general of Merkel's CDU, Peter Tauber, partly blamed the CSU for the losses in Berlin, which only 27 years ago was the front line of the Cold War.